Tetrahedral triple-Q magnetic ordering and large spontaneous Hall conductivity in the metallic triangular antiferromagnet Co1/3TaS2

• Main Authors: Park, Pyeongjae, Cho, Woonghee, Kim, Chaebin, An, Yeochan, Kang, Yoon-Gu, Avdeev, Maxim, Sibille, Romain, Iida, Kazuki, Kajimoto, Ryoichi, Lee, Ki Hoon, Ju, Woori, Cho, En-Jin, Noh, Han-Jin, Han, Myung Joon, Zhang, Shang-Shun, Batista, Cristian D, Park, Je-Geun
• Format: Journal Article
• Language: English
• Published: 12-11-2023
• Subjects: Physics - Materials Science; Physics - Strongly Correlated Electrons
• DOI: 10.48550/arxiv.2303.03760

Nature Communications 14, 8346 (2023) The triangular lattice antiferromagnet (TLAF) has been the standard paradigm
of frustrated magnetism for several decades. The most common magnetic ordering
in insulating TLAFs is the 120 structure. However, a new triple-Q chiral
ordering can emerge in metallic TLAFs, representing the short wavelength limit
of magnetic skyrmion crystals. We report the metallic TLAF Co1/3TaS2 as the
first example of tetrahedral triple-Q magnetic ordering with the associated
topological Hall effect (non-zero {\sigma}_{xy}(H=0)). We also present a
theoretical framework that describes the emergence of this magnetic ground
state, which is further supported by the electronic structure measured by
angle-resolved photoemission spectroscopy. Additionally, our measurements of
the inelastic neutron scattering cross section are consistent with the
calculated dynamical structure factor of the tetrahedral triple-Q state.